Ratan K. Guha, Raymond T. Yeh. Periodic Representation of Equal Matrix Grammars. Inf. Comput., 22(5):435-446, June 1973.
@article{GuhaY73, title = {Periodic Representation of Equal Matrix Grammars}, author = {Ratan K. Guha and Raymond T. Yeh}, year = {1973}, month = {June}, tags = {grammar}, researchr = {https://researchr.org/publication/GuhaY73}, cites = {0}, citedby = {0}, journal = {Inf. Comput.}, volume = {22}, number = {5}, pages = {435-446}, }